20881853 has 4 divisors (see below), whose sum is σ = 20897088. Its totient is φ = 20866620.

The previous prime is 20881849. The next prime is 20881859. The reversal of 20881853 is 35818802.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20881853 - 2² = 20881849 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20881859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5333 + ... + 8378.

It is an arithmetic number, because the mean of its divisors is an integer number (5224272).

Almost surely, 2^20881853 is an apocalyptic number.

It is an amenable number.

20881853 is a deficient number, since it is larger than the sum of its proper divisors (15235).

20881853 is a wasteful number, since it uses less digits than its factorization.

20881853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15234.

The product of its (nonzero) digits is 15360, while the sum is 35.

The square root of 20881853 is about 4569.6666180368. Note that the first 4 decimals coincide. The cubic root of 20881853 is about 275.3740496719.

The spelling of 20881853 in words is "twenty million, eight hundred eighty-one thousand, eight hundred fifty-three".